I Get A Rash On My Legs Every Time I Wear Socks. It Starts At My Ankle And Goes Up, The More Days I Wear Socks, The Worse It Gets. What Causes This?
I also think it could be an allergic reaction, but not to the sock itself. It could be that the elastic of the sock is what you're allergic to. You said it wasn't under the whole sock, just at the line.